Error when using CreaPrim addon
Just so this is said... this is a bug, meant for the developer of the addon to fix... I would file a bug report. 

ie: There most likely is no way to fix it without re coding the addon. 

community answer on bug reports here:

Best place to put bug reports?

EDIT

If the addon was working in a older version, then one solution would be to roll back to a previous version. Its a bit drastic but if you want to use the addon badly enough it would probably fix it.